I have absolutely no issues with him not drumming or sitting in a chair front of stage, what I do have an issue with is the vocal quality.
Some of the older performers just do not know when to give up/retire, it’s sad to see them performing as a shadow of their former selves, this is a reason why a lot of the high end tribute bands do so well, it’s like listening to the performance as it used to be.
There is one particular vocalist who is seventy and I have no hesitation in purchasing tickets for his tours, as I know his vocals are totally on point, that’s Paul Rodgers.